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You set a variable called box to be false, which is called a logic or Boolean value and can only take on one of two values. You can call these values one and zero or true and false. The main function calls a drawBox function and then enters an endless loop that simply checks the events. Take a closer look at the drawBox function. It takes in a variable, called state, that defines what colour the box is going to be. It is tested and you use the draw rectangle command from pygame. At first this looks complex, with lots of parameters or numbers in it, but it is quite simple.

You’d then have to go through all of it trying to find where the problem was. Instead, it is better to test as you go, checking each component before moving on to the next. Python provides a good means to do this. Toward the end of the file are the following lines: if __name__ == ‘__main__’: test_chicken() This code calls the test_chicken() function if the file is being run by itself, but doesn’t call the function if it is imported as a module. As such, it’s a good way of writing code that will test the behaviour of a module.

As such, if you have switches wired in series, then all of them have to be closed for the current to flow. Breaking one of them will break the circuit. In parallel, the flow of electricity splits and so closing any switch wired in parallel will allow the current to flow. This is because electricity tends to take the path of least resistance, and in this case, when the relay contacts close it has a much lower resistance than the almost infinite resistance of the open switch. 31 CHAPTER 2 THE TWITTERING TOY Attach another wire to each of the wires already connected to the terminals as shown in Figure 2-3.

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